/Engine/Source/Runtime/Engine/Classes/GameFramework/ProjectileMovementComponent.h
Handle case where projectile is sliding along a surface. Velocity will be parallel to the impact surface upon entry to this method.
True if simulation of the projectile should continue, false otherwise.
virtual bool HandleSliding ( [FHitResult](API\Runtime\Engine\Engine\FHitResult) & Hit, float & SubTickTimeRemaining )